Technical Service Bulletin : Anode Rods – Solution with Electric Isolation
4. Check to ensure that the blower motor and ANY pump that IS NOT dielectrically isolated from the GARN unit is wired to the same electrical panel:
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UNITS WITHOUT ELECTRIC HEATING ELEMENTS:
SINGLE POINT GROUNDING (OPTION 2):
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1.
Disconnect the independent ground rod:
5. If a pump connected directly to the GARN unit is wired to a different panel, then the pump OR blower motor or both must be electrically isolated:
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2. 3.
Check to ensure that the unit is set on foam:
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Isolate the blower motor with a blower motor isolation kit: (Part #: P-0125 on www.garnparts.com). Installation instructions for the isolation kit can be found on PAGE 8. A pump is dielectrically isolated if there is a means that breaks the metal-to-metal contact between the pump housing itself and the GARN unit. Examples of di-electric isolation include: dielectric unions, any length of PEX, or isolation valve flanges attached directly to the pump (such as Grundfos dielectric isolation valves). 6. Single point grounding is now complete. All ground pathways in contact with the GARN unit should now be wired to the same panel, and, ultimately, the same ground. 5
Anode Rods – Part 3: Electric Isolation
Rev: 20151130 Page: 5 of 8
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